TaiSi’s micro-touch solution empowers all scenarios of automotive smart surfaces

According to Zhu Jianru, head of TaiSi's Micro Marketing Department, the reason why TaiSi's micro automotive touch solution has been favored by many customers, including the world's leading parts manufacturers and major car manufacturers, in a short period of time is mainly due to the following. What time is it:

With the help of this interview, Zhu Jianru also comprehensively sorted out and introduced the reference design solutions of Tai Silicon Micro's touch products. “The current demand for touch controls covers almost every area of ​​the car’s interior and exterior body, including door handles, tailgate buttons, tailgate logo switches, charging cover switches, kick sensors, smart B-pillars, door interior panel switches, steering wheel buttons, and steering wheels. Hands-off detection, air conditioning control panel, top controller, reading light, seat adjustment, gear control switch, etc.”

The following is a collection of some complete reference design solutions that are available and released to the public.

Capacitive touch + pressure detection door handle mainly consists of 4 modules:

1. Communication module: Generally uses LIN interface or carrier communication circuit, mainly used to communicate with the host.

2. Capacitance detection module: includes detection channel and reference channel, mainly used for capacitance detection and some misoperation scene recognition.

3. Pressure detection module: including resistive pressure detection module and sampling circuit, used to detect surface pressure

4． Central data processing module: performs fusion processing on capacitance data and pressure sensing data, obtains the final result, and notifies the host.

TaiSiMicro's capacitance + pressure detection 3D touch car door handle solution uses a three-detection channel solution, namely the capacitance detection channel, the capacitance reference channel, and the pressure detection channel. These three channels will collect the current capacitance and pressure in real time. Data, because water mist, water flow and human hand pressure have different effects on the three channels, so through combined judgment and data fusion processing, various interference scenes and normal human hand touch can be well distinguished.

The use of 3D touch solutions to realize touch door handle applications completely solves the biggest and most challenging pain point in such applications: waterproofing. At the same time, compared with traditional pure capacitive touch solutions, the cost required for implementation based on TaiSi micro-touch chips has not increased significantly.

The reading light mainly consists of 4 modules:

1 . Communication module: Generally uses LIN interface or carrier communication circuit, mainly used to communicate with the host.

2 . Capacitance detection module: includes detection channel and reference channel, mainly used for capacitance detection and some misoperation scene recognition.

3 ． Central data processing module: perform fusion processing on capacitance data, obtain the final result, and notify the host.

4 . Lighting control module: mainly controls the brightness and effect of the light group, such as fading on and off, brightness adjustment

TaiSi's micro-touch reading lamp reference solution has passed the German Volkswagen EMC test execution standard TL81000-202109. It is currently an extremely rare domestic touch chip solution that can pass relevant test specifications.

The kick detector mainly consists of 3 modules:

1 . Communication module: Generally uses LIN interface or carrier communication circuit, mainly used to communicate with the host.

2 . Capacitance detection module: includes 2 detection antennas, mainly used for capacitance detection and some misoperation scene recognition.

3 ． Central data processing module: analyzes the capacitance data, identifies kicking movements and other interference movements, and transmits signals to the host.

The kicking solution provided by Tai Silicon Microelectronics has a very obvious leading advantage. The single-chip solution has very streamlined peripheral circuits and low overall cost. At the same time, by combining advanced algorithms and chip hardware power consumption advantages, the average system power consumption can be as low as 150uA, which is an absolute leader in the industry.

Door interior switch detection mainly consists of 5 modules:

1. Communication module: Generally uses LIN interface to communicate with the host.

2. Capacitance detection module: includes multiple capacitance detection channels, used to confirm whether each button on the panel is triggered.

3. Pressure detection module: It includes a resistive pressure detection module and a sampling circuit, which is used to detect surface pressure.

4． Backlight display module: including various types of LEDs and backlight drive circuits, providing various lighting feedback for key events.

5． Central data processing module: performs fusion processing on capacitance data and pressure sensing data, obtains the final result, and notifies the host.

TaiSiMicro's solution can perform pressure simulation based on the material of the panel and the entire stress area to determine how many pressure sensors to place and the specific locations to place the pressure sensors. The pressure sensors are used to detect whether the human hand is pressing, and capacitive touch is used to detect the pressure. To detect the specific position pressed by the human hand, the software will perform corresponding filtering algorithms and detection algorithms on each channel of raw data, and finally output the correct result. This can be achieved by adding backlight or vibration feedback according to the specific needs of the customer.

The top controller mainly consists of 5 modules:

1 . Communication module: Generally uses LIN interface or carrier communication circuit, mainly used to communicate with the host.

2 . Capacitance detection module: includes detection channel and reference channel, mainly used for capacitance detection and some misoperation scene recognition.

3 ． Central data processing module: performs fusion processing on capacitance data and pressure sensing data, obtains the final result, and notifies the host.

4 . Lighting control module: mainly used to control the brightness and effect of the ceiling light, such as fading on and off, brightness adjustment

5 ． Peripheral control module: like some peripheral controls, such as skylights, ambient lights, warning lights, etc.

TCAE12 has both touch detection and system main control functions. A single chip realizes all functions. It is an increasingly common and cost-effective solution for top controllers that support touch functions.

The tailgate pressure-sensitive switch mainly consists of 4 modules:

1. Communication module: Generally uses LIN interface to communicate with the host.

2. Capacitance detection module: includes detection channels and accidental touch prevention channels, used for capacitance detection and some misoperation scene recognition.

3. Pressure detection module: includes a resistive pressure detection module and a sampling circuit, used to detect surface pressure.

4． Central data processing module: performs fusion processing on capacitance data and pressure sensing data, obtains the final result, and notifies the host.

In addition, backlight control or vibration feedback control can be added according to customer specific requirements.

The tailgate pressure-sensitive switch uses the capacitance detection channel, capacitance prevention channel and pressure-sensing channel as a set of data to intelligently judge various current scenarios, such as car washing, car cleaning, human body leaning, foreign object pressing and normal human hands. operate. Although there are great differences in the tailgate LOGO switches of various car manufacturers, because all capacitance detection and pressure detection algorithms and related codes of Taisi Micro are independently developed, customized hardware and software design can be carried out according to customer needs. The structural form adds corresponding detection modules to flexibly respond to various scenarios.

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